Protective circuit for cathode layer, protective method and OLED display device

Abstract

A protective circuit for a cathode layer, a protective method and an OLED display device are provided. The protective circuit includes a power supply, and an electronic output node electrically connected with a negative electrode of the power supply. Electric potential of the electronic output node is the same as the electric potential of the cathode layer in a working state of the OLED display device, the electronic output node is connected to the cathode layer of the OLED display device, and a positive electrode of the power supply is connected to a voltage node with any potential other than an anode of the OLED display device via a wire, so that electrons can be continuously provided by the power supply to the cathode layer in a non-working state of the OLED display device.

The invention claimed is: 
     
       1. A protective circuit for a cathode layer, applied to a non-working state of an organic light-emitting diode display device, wherein the protective circuit comprises
 a power supply, and an electronic output node electrically connected with a negative electrode of the power supply, 
 wherein an electric potential of the electronic output node is the same as an electric potential of the cathode layer in a working state of the organic light-emitting diode display device, the electronic output node is connected to the cathode layer of the organic light-emitting diode display device, and a positive electrode of the power supply is connected to a voltage node with any potential other than an anode of the organic light-emitting diode display device via a wire, so that electrons can be continuously provided by the power supply to the cathode layer in a non-working state of the organic light-emitting diode display device, and 
 wherein a voltage of the power supply is equal to a working voltage of the organic light-emitting diode display device, and the protective circuit further comprises a switching element, one end of the switching element is connected to the negative electrode of the power supply, and the other end of the switching element is connected to the cathode layer by the electronic output node. 
 
     
     
       2. The protective circuit claimed as  claim 1 , wherein
 in a working state of the organic light-emitting diode display device, the switching element is turned off, so that connection between the negative electrode and the cathode layer is disconnected, and 
 in a non-working state of the organic light-emitting diode display device, the switching element is turned on, so that the negative electrode is connected to the cathode layer. 
 
     
     
       3. The protective circuit claimed as  claim 1 , wherein the positive electrode of the power supply is grounded via a wire. 
     
     
       4. An organic light-emitting diode display device, comprising the protective circuit of  claim 1 . 
     
     
       5. The OLED display device claimed as  claim 4 , wherein the positive electrode of the power supply is grounded via a wire. 
     
     
       6. The OLED display device claimed as  claim 4 , further comprising a packaging structure disposed on the cathode layer. 
     
     
       7. A protective circuit for a cathode layer, applied to a non-working state of an organic light-emitting diode display device, wherein the protective circuit comprises
 a power supply, and an electronic output node electrically connected with a negative electrode of the power supply, 
 wherein an electric potential of the electronic output node is the same as an electric potential of the cathode layer in a working state of the organic light-emitting diode display device, the electronic output node is connected to the cathode layer of the organic light-emitting diode display device, and a positive electrode of the power supply is connected to a voltage node with any potential other than an anode of the organic light-emitting diode display device via a wire, so that electrons can be continuously provided by the power supply to the cathode layer in a non-working state of the organic light-emitting diode display device, and 
 wherein a voltage of the power supply is greater than a working voltage of the organic light-emitting diode display device, and the protective circuit further includes a voltage adjuster, configured for adjusting the electric potential of the electronic output node, 
 wherein a negative electrode of the power supply is electrically connected with the electronic output node through the voltage adjuster, and 
 the protective circuit further comprises a switching element, which is disposed between the electronic output node and the voltage adjuster. 
 
     
     
       8. The protective circuit claimed as  claim 7 , wherein the positive electrode of the power supply is grounded via a wire. 
     
     
       9. An organic light-emitting diode display device, comprising the protective circuit of  claim 7 . 
     
     
       10. The organic light-emitting diode display device claimed as  claim 9 , wherein the positive electrode of the power supply is grounded via a wire. 
     
     
       11. The organic light-emitting diode display device claimed as  claim 9 , further comprising a packaging structure disposed on the cathode layer.